Shetland

Tosh digs into Robert Tulloch's career in the police

On a mission to find out the identity of the Callaghans' contact in Shetland, Calder piles the pressure on Louden. He reluctantly agrees, but ultimately ends up in grave danger. Stevie is elated to have her sister Amy all to herself, but her mood sours when Calder asks her to come in for further questioning. Sandy tells Tosh that he believes Robert Tulloch was a corrupt police officer. Aware that the revelation will unsettle Billy, Tosh decides to secretly investigate further